Compact-Type Quasi-2D Perovskites MAPbBr₃@FABr: Reduced Interlayer Distances Enable Ultralow Threshold Lasing and...

Area of Science:

• Materials Science
• Optoelectronics
• Nanotechnology

Background:

• Quasi-2D perovskites show promise for lasers due to high optical gain and stability.
• Thick spacer layers in traditional quasi-2D perovskites hinder charge transport and limit performance.

Purpose of the Study:

• To design and investigate compact-type quasi-2D perovskites with reduced interlayer spacing.
• To enhance energy funneling, charge transport, and laser performance in quasi-2D perovskites.

Main Methods:

• Synthesized compact-type quasi-2D perovskites with reduced interlayer spacing.
• Fabricated MAPbBr3@FABr micro-ring laser arrays.
• Investigated amplified spontaneous emission (ASE) thresholds, optical gain, and electron mobility.
• Tuned ASE properties by varying halogen composition.

Main Results:

• Achieved the lowest reported ASE threshold (1.82 µJ cm⁻²) for green-emitting quasi-2D perovskites.
• Obtained a high optical gain coefficient of 413.77 cm⁻¹.
• Demonstrated over tenfold increase in electron mobility compared to traditional counterparts.
• Fabricated micro-ring lasers with a quality factor of ~1802 and low thresholds (~1.89 µJ cm⁻²).
• Achieved tunable, low-threshold ASE across a broad spectral range using mixed-halide variants.

Conclusions:

• Compact-type quasi-2D perovskites with reduced interlayer spacing significantly improve laser performance.
• This design facilitates rapid energy funneling and enhanced charge transport.
• The developed materials and structures offer a viable pathway for practical, high-performance perovskite lasers.